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Q.

Which of the following organic compound gives red color in Lassaign’s test

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a

NH2CSNH2

b

NH2CONH2

c

CH3SH

d

C6H5N=NC6H5

answer is A.

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Detailed Solution

  • When Nitrogen and Sulphur are present together in an organic compound, they give red color in Lassaigne's test. 
  • So, the compound sodium thiocyanate NaCNS will give red color in Lassaigne's test.
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